What are the reasons and solutions for the low extrusion volume of high-speed injection molding machine? High speed injection molding machine After a period of power on, the extrusion amount gradually decreases, mainly due to the following reasons:
1. The cold air has been turned on for a long time, and the mold surface becomes cold
At this time, we must check whether the rubber at the die surface outlet has been plasticized and melted.
2. Start temperature too low
At this time, it is necessary to check whether the temperature of each part of the extrusion barrel and die head meets the standard requirements, but if the heating time is insufficient, will the heaters and thermocouples with inconsistent internal and external temperatures be damaged? If the electrical parts are damaged, they should be repaired or replaced immediately.
3. Excessive temperature of extrusion barrel or die head, wear of screw and barrel in melting section, carbon deposition of screw, unsmooth blanking, etc
Check the sensitivity of the temperature controller and handle it properly. The mold head temperature controller shall be of high sensitivity.
4. The drive belt is loose or falling off
The old drive belt should be replaced immediately, and the available one should be installed with idler pulley, and the belt tension should be adjusted to prevent the belt from loosening and falling off again.
5. Adhesive for screw supply department
Before each shutdown, slightly lower the temperature until there is no glue in the screw feeding part; When it is found that the screw is stuck by the glue after starting up, the screw should be cleaned first. If it is really inconvenient to clean, the plastic rod or wooden rod should be used to squeeze the material at the feeding port with force, so as to move the glue stuck to the feeding part of the screw forward. At this time, it should be noted that the plastic rod or wooden rod is bitten by the screw, or a piece of wood falls off. Never use a metal rod.
6. The throat of the feeding drum is caked with rubber
The water temperature of the cooling water jacket at the throat junction of the charging cylinder shall be controlled below 40C °. If the filter is blocked, a new filter must be replaced immediately.
7. Low back pressure
The phenomenon caused by low back pressure is the instability of materials, which can be corrected by increasing the back pressure.
8. The voltage fluctuation of DC motor is too violent. Install voltage stabilizer to ensure stable voltage.
9. Uneven rotating speed of clamping rod or excessive pressure between rolls
At this time, check whether the clip is worn, loose or falling off from the eccentric drive belt; When the pressure between rolls is too low, slippage will occur. The air pressure or spring can be adjusted to increase the pressure.
10. Too much recycled material mixed with crushed
It is necessary to reduce the proportion of mixed powder. If it is necessary not to add crushed materials of recycled materials, it is better to make granular stable materials first.
The above is about the reasons and solutions for the low extrusion volume of high-speed injection molding machine. I want to know more about injection molding machine Knowledge friends can continue to pay attention to us.
